Câu hỏi phỏng vấn Reactjs
Câu hỏi

What is the difference between state and props ?

Câu trả lời

In ReactJS, understanding the difference between state and props is crucial for managing data flow and UI rendering behavior within applications. Here’s a detailed explanation:

State

  • Definition: State is a built-in React object that a component can use to store data that may change over time. It is managed within the component and is local to that component.
  • Mutability: State is mutable, meaning it can be modified using setState or useState hooks. Changes to the state trigger the component to re-render, reflecting updates in the UI.
  • Usage: State is typically used for data that is specific to a component and not derived from parent components. It is suitable for storing values like user input, validation states, or any dynamic data that affects the rendering or behavior of the component[1][2][3][4][5][6][7][8].

Props

  • Definition: Props, short for properties, are read-only configurations passed to a component by its parent. They are similar to function parameters and are used to pass data down the component tree.
  • Immutability: Props are immutable from the perspective of the receiving component. A component cannot change its props, but it can decide how to use them and pass them to its child components.
  • Usage: Props are used to configure components, passing stateful values from parent to child components. They help maintain a unidirectional data flow and can include values or functions that children can use to communicate back to their parent[1][2][3][4][5][6][7][8].

Key Differences

  • Ownership and Control: State is owned and controlled by the component itself, while props are pas...
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